Detergent bar



FIG. 1 is a perspective view of a detergent bar showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view being identical;

FIG. 3 is a front side elevational view thereof, the _back side elevational view, top plan view, and bottom plan view being identical. 

The ornamental design for a detergent bar, as shown and described. 